/**
 * ESL (Enterprise Standard Loader)
 * Copyright 2013 Baidu Inc. All rights reserved.
 *
 * @file JS Loader-Plugin
 * @author errorrik(errorrik@gmail.com)
 */

// 构建环境暂不支持分析，为了能合并该plugin到loader里，
// 只能暂时使用具名id
define('js', {
    load: function (resourceId, req, load, config) {
        function onload() {
            var readyState = script.readyState;
            if (
                typeof readyState == 'undefined'
                || /^(loaded|complete)$/.test(readyState)
            ) {
                script.onload = script.onreadystatechange = null;
                script = null;
                load(true);
            }
        }

        var script = document.createElement('script');
        script.src = req.toUrl(resourceId);
        script.async = true;
        if (script.readyState) {
            script.onreadystatechange = onload;
        }
        else {
            script.onload = onload;
        }

        var parent = document.getElementsByTagName('head')[0]
            || document.body;
        parent.appendChild(script) && ( parent = null );
    }
});
